Not sure what this is for, but if you are allowed to use the original xbox logo that use it in this design. Also I think you should make the content area white or maybe at least very light gray instead of this dark gray. The seperation of the header and the nav is kinda dull - maybe try with a green line... And I don't like those green arrows on the nav buttons they don't do anything for me - I would try a green under line on the nav text instead of the green arrows... I'll give you 6/10 for this try.